Dart PRO1 Small Block Chevrolet Platinum 215cc/64cc 23° Aluminium Cylinder Head Assembled Suit Hydraulic Roller or Solid Flat Tappet Cam.
Serious street performance, modified oval track and bracket racing. Mid-range to 7,000 RPM. Best for 400+ cubic inch engines.
Dart PRO1 23° 215cc Platinum series heads are for big cubic inch, high RPM applications which favour peak power over low end flexibility.
Long wearing Bronze valve guides, screw-in studs, multi-angle intake seats with hardened, radiused exhaust seats are standard. Best of all, our precision cast ports produce outstanding airflow without time consuming porting.
Assemblies include Stainless Steel valves, premium springs, locks, retainers, studs, guide plates and seals.
Heads are sold individually
Part# 11511122P
Material: RMR Cast Aluminium Alloy
Comb Chambers: 64cc
Intake Valve Dia: 2.05”
Intake Port volume: 215cc
Intake Port Dim: 2.150” x 1.190”
Int Port Location: Stock
Intake Gasket: Fel-Pro # 1206
Exh Valve Dia.: 1.600”
Exh Port volume: 75cc
Exhaust Port Dim: 1.375” x 1.325” w
Exh Port Location: Stock location & bolt pattern
Exhaust Gasket: Fel-Pro# 1404 or 1405
Flow, Intake: 276cfm @ .600” lift / 28”
Flow, Exhaust: 180cfm @ .600” lift / 28”
Head Bolts: Dart bolt kit PN# 66220011
Head Studs: Dart stud kit PN# 66120011
Manifold: Alum Single Plane Dart PN# 42411000
Milling: Min. 58cc = .060” (.0065” = 1cc) Flat Mill
Angle mill .125” safely / .200” = 49cc 1.5° (carefully)
Pistons: Most 23°aftermarket pistons.
Push Rod length: Stock thru +.100” Should always measure (Stock length = 7.800”)
Push rod Guide Plate: Dart adjustable guide Plate PN# 27001410
Retainers: Steel (10°) / 1.250” (7°)
Spark Plug: Angle, .750” reach, gasketed seat
Spring Pockets: 1.550” OD (.030” deeper max)
Springs: Our Assembly: 1.437D = 130# @ 1.800” / .600” max
Valve Length: Std. = 4.915” w/ 1.250 & 1.437 / 5.015” (+.100) w/ 1.550
Valve Stem Dia: .3415” - 11/32”
Valve Train: STD SBC 3/8” or 7/16” stud mount
Valve Guides: .439” OD Int = Mag-bronze Exh = Mag-bronze (.002” press)
Valve Guide length: 2.100”
Valve Guide clearance: .0014” - .002” (with our .3415 dia. valve stem)
Valve Guide Spacing: 1.890” moved .030” from stock
Valve Seats: Hardened Ductile Iron, .006” press
Valve Seat dim. Int - 2.160”x 1.810” x .350” Exh - 1.650”x 1.350”x .350”
Valve Seat angles: Int = 32° - 45° - 60° - 70°- 80° Exh = 37° - 45° - radius
Stud Girdle: Dart stud girdle PN# 64110002
Torque: Head Bolts = 70 ft/lb
Rocker Studs = 55 ft/lb
Manifold = 35 ft/lb
Block Use: Any SBC Iron or Aluminium
Weight: 23 lbs Bare – 28 lbs Assembled
SBC SB Chev 23 degree cylinder heads